A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5975550 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 30 35 42 45 49 50 63 70 75 90 98 105 126 147 150 175 210 225 245 271 294 315 350 441 450 490 525 542 630 735 813 882 1,050 1,225 1,355 1,470 1,575 1,626 1,897 2,205 2,439 2,450 2,710 3,150 3,675 3,794 4,065 4,410 4,878 5,691 6,775 7,350 8,130 9,485 11,025 11,382 12,195 13,279 13,550 17,073 18,970 20,325 22,050 24,390 26,558 28,455 34,146 39,837 40,650 47,425 56,910 60,975 66,395 79,674 85,365 94,850 119,511 121,950 132,790 142,275 170,730 199,185 239,022 284,550 331,975 398,370 426,825 597,555 663,950 853,650 995,925 1,195,110 1,991,850 2,987,775 and 5,975,550, with no remainder.
Since 5,975,550 cannot be divided by just 1 and 5,975,550, it is not a prime number.